72 citations · 234 across the 15 of their papers we have counts for
10 papers · 1 filter
Theories of gravity with nonminimal matter-curvature coupling and the de Sitter swampland conjectures
Orfeu Bertolami, Cláudio Gomes, Paulo M. Sá
We discuss, in the context of alternative theories of gravity with nonminimal coupling between matter and curvature, if inflationary solutions driven by a single scalar field can b…
Quantum kinetic theory of Jeans instability in non-minimal matter-curvature coupling gravity
Cláudio Gomes, Kamel Ourabah
We present a quantum treatment of the Jeans gravitational instability in the Newtonian limit of the non-minimal matter-curvature coupling gravity model. By relying on Wigner functi…
Cassini and extra force constraints to nonminimally coupled gravity with screening mechanism
Riccardo March, Orfeu Bertolami, Marco Muccino +2
We consider a nonminimally coupled curvature-matter gravity theory at the Solar System scale. Both a fifth force of Yukawa type and a further non-Newtonian extra force that arises…
Stability Conditions for the Horndeski Scalar Field Gravity Model
Cláudio Gomes, Orfeu Bertolami
We constrain the viable models of Horndeski gravity, written in its equivalent Generalised Galileon version, by resorting to the Witten positive energy theorem. We find that the fr…
A note on the comments of arXiv:2003.10154 [gr-qc] to our paper Nonminimally Coupled Boltzmann Equation I: Foundations (arXiv:2002.08184 [gr-qc])
Orfeu Bertolami, Cláudio Gomes
In this note we comment on remarks about our recent effort to understand the specificities of the Boltzmann equation in the context of the alternative theories of gravity with non-…
Nonminimally Coupled Boltzmann Equation I: Foundations
Orfeu Bertolami, Cláudio Gomes
We derive the Boltzmann equation in the context of a gravity theory with non-minimal coupling between matter and curvature. We show that as the energy-momentum tensor is not conser…
Using numerical methods from nonlocal optics to simulate the dynamics of N-body systems in alternative theories of gravity
Tiago D. Ferreira, Nuno A. Silva, O. Bertolami +2
The generalized Schrödinger-Newton system of equations with both local and nonlocal nonlinearities is widely used to describe light propagating in nonlinear media under the paraxia…
Nonminimally coupled Weyl gravity
Cláudio Gomes, Orfeu Bertolami
Weyl gravity in the presence of a non-minimal matter-curvature coupling is presented. Some properties arising from the non-metricity give rise to a second order theory whose vacuum…
Gravitational waves in theories with a non-minimal curvature-matter coupling
Orfeu Bertolami, Cláudio Gomes, Francisco S. N. Lobo
Gravitational waves in the presence of a non-minimal curvature-matter coupling are analysed, both in the Newman-Penrose and perturbation theory formalisms. Considering a cosmologic…
Inflation in non-minimal matter-curvature coupling theories
Cláudio Gomes, João G. Rosa, Orfeu Bertolami
We study inflationary scenarios driven by a scalar field in the presence of a non-minimal coupling between matter and curvature. We show that the Friedmann equation can be signific…